A1900 Electronics, Data Acquisition, and Data Analysis

The electronics setup for the A1900 detectors must provide a stable operating environment to ensure reliable A1900 support for all NSCL experiments. The philosophy behind this setup, therefore, is that it is a permanent installation.

Most signals from the A1900 detectors are fed through two 16-channel amplifier-ADC chains. The current channel assignments for the two amplifiers is posted here. Several unused channels are available to accommodate auxiliary detectors without the need to modify the timing and trigger electronics.

The electronics setup features computer-selectable options for setting the trigger and timing. The trigger options include:

• the FP PIN
• the FP scintillator
• the XF PIN
• the XF scintillator
• the anode from the downstream FP PPAC
• the I2 scintillator
• the FP germanium detector
• the first (upstream) detector in the FP stack
• the second detector of the FP stack
• an input from the patch panel in the data acquisition area
• a test pulser.

The electronics setup includes four TACs for generating timing spectra as described in the table below:

	START SIGNAL	STOP SIGNAL
TAC1	selectable	I2 scintillator north
TAC2	selectable	I2 scintillator south
TAC3	selectable	cyclotron RF
TAC4	FP scintilator south	cyclotron RF

The selectable start signals can be set all either to:

1. FP PIN
2. FP scintillator north
3. XFP scintillator.